Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat.
B) The helium abundance in a galaxy is 29%.
C) The rate of expansion of the universe has changed over time.
D) Stars began to shine only a few hundred million years after the Big Bang.
A) The geometry of the universe is curved, not flat.
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A glass flask has a volume of 500 mL at a temperature of 20° C. The flask contains 492 mL of mercury at an equilibrium temperature of 20°C
The temperature is raised until the mercury reaches the 500 mL reference mark. At what temperature does this occur? The coefficients of volume expansion of mercury and glass are 18 ×10-5 K-1 (mercury) and 2.0 ×10-5 K-1 (glass). A) 120°C B) 110°C C) 100°C D) 140°C E) 130°C
In a mass spectrometer, a single-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?
A) 3.2 × 10-28 kg B) 6.4 × 10-28 kg C) 1.7 × 10-27 kg D) 4.5 × 10-27 kg E) 3.1 × 10-31 kg
Why can't we send a space mission to a star system outside of our own?
What will be an ideal response?
A rain shadow is associated with
A) the leeward slope of a mountain. B) orographic lifting. C) descending dry air. D) descending dry air on the leeward slope of a mountain.